#include <iostream>
int cosa (int n1, int n2, char signo);
using namespace std;
int main()
{
    cout<<cosa(20,5,'+');
    return 1;
}

int cosa (int n1, int n2, char signo)
{
    if (signo=='+')
        return n1+n2;
    else if(signo=='-')
        return n1-n2;
    else if (signo=='*')
        return n1*n2;
    else if (signo=='/')
        return n1/n2;
}
